Evil Tribbles may look cute, but they can really make a loud noise when they ROAR!!!

A 1-foot tall Green Evil Tribble can register 10 GSU (Galactic Sound Units) on a sound-measuring device that is 5 feet away. Yellow Evil Tribbles are twice as loud, and Red Tribbles... THREE times as loud as their yellow counterparts!

So anyway, one day Spork the Vulcan was out doing a bit of maintenance on the exterior of the Space Station, and before him he saw, to his fright, the biggest Evil Tribble he had ever seen. It was 5 feet high, 10 feet away and red! It looked straight at Spork, and gave the loudest ROAR it could!!!

Nicely done quiz! A bit of severe nit picking is that the ROAR sound would likely resonate throughout the Red tribble's body, conduct through the shell of the station, conduct through Spork's body in contact with the station, and (if Spork is holding the recording device at the time) register some GSU value based on the vibrations conducted to the device. Turn the station into one with a non-sound-conducting outer shell, and the sound does measure 0.0 GSUs as stated.

Fun teaser, but could have been made a little better by including the color of the new, giant Tribble, an inclusion that might have tricked many into running down the wrong path of trying to do complex math computations to determine the GSU rating of the Tribble's roar.